<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :rules="Rules" :model="loginForm" label-width="80px" class="login_form">
                <!-- 用户名 -->
            <el-form-item prop="username" label="用户名">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password" label="密码">
            <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock" ></el-input>
            </el-form-item>
            <!-- 按钮区域 -->
            <el-form-item >
            <el-row class="btns">
                <el-button type="primary" @click="login">登录</el-button>
             <el-button type="info" @click="resetLoginFrom">重置</el-button>
             </el-row>
            </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>

export default {
    data() {
      return {
          //登录表单数据
        loginForm: {
          username: "admin",
         password:"123456"
        },
        //表单验证规则
        Rules:{
            //验证用户名是否合法
            username:[
                { required: true, message: '请输入登录名称', trigger: 'blur' },
                { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
            ],
            //验证密码是否合法
            password:[
                { required: true, message: '请输入正确密码', trigger: 'blur' },
                { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
            ]
        }
      }
    },
    methods:{
        resetLoginFrom (){
                this.$refs.loginFormRef.resetFields()
        },
        login(){
            this.$refs.loginFormRef.validate(
              async  valid=>{
                    if(!valid) return;
                      const {data:res} = await this.$http.post('login',this.loginForm)
                       if(res.meta.status !== 200){
                           return this.$message.error('登录失败')
                       }

                        this.$message.success('登陆成功')
                           //1.将登录成功后的token保存到客户端的sessionStorage中
                        // 项目中出现了登录之外的其他api接口,必须在登录之后才能访问
                        // token只应在当前网站打开期间生效,所以将token保存在seesionStorage(会话期间生效,而localStorage是持久化存储)中
                        // 2.通过编程式导航跳转到后台主页，路由地址是/home
                       
                       window.sessionStorage.setItem('token',res.data.token)
                       this.$router.push('/home')
                }
            )  
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    height: 100%;
    background-color: #2b4b6b;
    position: relative;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: white;
    border-radius: 5px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    position: relative;
    .avatar_box{
        height: 130px;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: white;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        img{
            width: 100%;
            height: 100%;
        border-radius: 50%;
        background-color:#eee ;
        }
    }
}
.btns{
    display: flex;
    justify-content: center;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding-right:20px;
    box-sizing: border-box;
}
</style>